Malicious PDF — malware analysis report

Static analysis result for SHA-256 2807664332336c54…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 04:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd2ed1918c3c4cc48fb5aa160392b1f7 SHA-1: 4abe8544df14748f59bf569345907867299832e2 SHA-256: 2807664332336c54f1c1ae3d1aa17476f44ae3935c4a5050fa7157566f180a11
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Numerous heuristics indicate the PDF contains a link farm, with several links pointing to IP addresses or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://crosswaysrecruitment.com/userfiles/file/kisirevotesemu.pdf
    • https://ceramicasvillaflor.cl/UserFiles/File/8041761675.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qobds2pj4bkfugr6qgs2uuom4m/36658713423.pdf
    • http://etpatatietpatata.com/userfiles/files/sefivadegan.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/24653377724.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/30886333537.pdf
    • http://vibestedu.com/_UploadFile/Images/file/73935924112.pdf
    • http://efuturesthai.com/uploads/file/54895819434.pdf
    • http://globalfeedindustry.com/upload/files/fezofuwupiwerewuvege.pdf
    • http://e-sheremet.com/img/xufutavijirabimoj.pdf
    • https://uclerbaklava.com/resources/file/24564037370.pdf
    • http://140.121.125.49/ckfinder/userfiles/files/20210909_110409.pdf
    • http://asesorgubernamental.com/images/file/61912436852.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b545c6dd2b---47710970965.pdf
    • http://wawa757.com/uploads/files/97626309500.pdf
    • http://yuqiaohome.com/uploads/files/202109171903076776.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/91933186798.pdf
    • https://citronel.com/userfiles/files/lazijixuwap.pdf
    • http://joyear.com/ckfinder/userfiles/files/ranabo.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/52821321305.pdf
    • https://thefertilizerequipment.com/d/files/77995150919.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459a5f2a393---5399557931.pdf
    • https://superpart.com/files/kazojujabijadov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=plant+vs+zombie+heroes+mod+apk+unlimited+gems
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db27.bin
92d0dbe0244b59c27c8826ea86543cfd9c6bc8ef374fdd3cb910e88e93869ae0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 11300 bytes
font_01_sfnt_off0000f52a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16792 bytes
font_02_sfnt_off00010d3c.bin
07b98171c2cf6ba4978a89da5847b08cfa211b8d03e31ca3601c9a9590a066af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 19180 bytes